HAWASSA UNIVERSITY
Institute Of Technology
School Of Civil Engineering
Post Graduate Studies
Hydraulic Engineering
Sediment Transport and River Engineering
Lab Report
Done By:
1. Bereket Seifu (PGHy 010/08)
2. Desta Usi (PGHy 015/08)
3. Elias Yosef (PGHy 016/08)
4. Gemedo Gelgelu (PGHy 047/08)
5. Girma Getu (PGHy 024/08)
6. Gonse Amalo (PGHy 055/07)
Submitted To:
Matewos T. (M.Sc)
September 5, 2016
Hawassa, Ethiopia
Sediment Transport and River Engineering
Experiment No 1:
Title: Discharge Measurement
Objective:
The objective of the experiment is to measure flow discharge of Tikur Wuha River using
current meter and velocity area method.
Material:
The materials used for experiment can be listed as follows:
Current meter
Stop watch
Graph paper
Gauging meter
Standing road
Procedure:
The procedure is to measure and plot on graph paper the cross-section of the stream and
to imagine that it is divided into strips of equal width as shown in Figure 22. The average
velocity for each strip is estimated from the mean of the velocity measured at 0.2 and 0.8
of the depth in that strip.
A current meter measures the velocity at a single point, and several measurements are
required to calculate the total flow. The procedure is to measure and plot on graph paper
the cross-section of the stream and to imagine that it is divided into strips of equal width
as shown in Figure 22. The average velocity for each strip is estimated from the mean of
the velocity measured at 0.2 and 0.8 of the depth in that strip. This velocity, times the
area of the strip, gives the flow for the strip and the total flow is the sum of the strips.
Table 2 shows how the calculations will be done for data shown in Figure 22. In practice,
more strips would be used than the number shown in Figure 22 and Table 2. For shallow
water a single reading is taken at 0.6 of the depth instead of averaging the readings at 0.2
and 0.8 of the depth.
Lab Report Page 1
Sediment Transport and River Engineering
Tables for area velocity method:
Re
sult:
The result from the experiment was a discharge and it can used for any computation of
hydraulic structure that can be built across Tikur Wuha River.
Lab Report Page 2
Sediment Transport and River Engineering
Experiment No 2:
Title: Sediment Transport Measurement
Objective:
The objective of the experiment is to measure sediment transport of Tikur Wuha river
using Depth Integrating Sampler.
Material:
The materials used for experiment can be listed as follows:
US DH 48
Stop watch
Meter
Oven dry
Rod
Procedure:
The procedure to do the experiment can be as follows:
One can allow for variations in sediment concentration at different points in the stream by
using an integrating sampler that is one which gives a single sample combined from small
sub-samples taken from different points. A typical sampler is illustrated in Figure 39 and
consists of a glass bottle inserted in a fish-shaped frame mounted on a rod when gauging
small streams or suspended on a cable for larger streams. For the bottle to fill smoothly
and evenly when below the surface it is necessary to have one nozzle or orifice for entry
of water, and a second pipe through which the displaced air is ejected.
In operation, the sampler is moved from the surface down to the bed and back up to the
surface while sampling continuously. A few trial runs will establish how long is required
for the bottle to fill during this double journey.
Lab Report Page 3
Sediment Transport and River Engineering
The following diagram shows how the River reach can be divided and sampled:
Result:
The result from the experiment can help us to estimate total suspended load that can be
transported by Tikur Wuha River.
Lab Report Page 4
